The reported one from the Argentinian friend is a fable.
The 90% of our coins they have stayed in mouth to the corpse ... have we the 90% of blue patina
The truth is that the patina
of the coins is the result of a strange combination.
1)Composition of the alloy
2) Components of the contained salts in the ground (each ground has his
3) Degree of damp of the ground.
It is try the fact that terrestrial in same two equal coins give to the corpse they engage colour of different patina
.....as tells is my experience.ser